Research undertaken with experimental studies on the topic of secretion of pancreatic enzymes, followed by scientific activity with endoscopy and endosonography in gastrointestinal diagnostics. Publications on this topic in journals such as "The New England Journal of Medicine", "Gastroenterology", "Gut", "Endoscopy", "Gastrointestinal Endoscopy", "Scandinavian Journal of Gastroenterology", "Deutsche Medizinische Wochenschrift", "Zeitschrift für Gastroenterologie" etc (230 publications), total impact factor 1000. Numerous review articles and more than 1500 lectures on these and other endoscopic/gastroenterologic topics. Editor of two books on endoscopic ultrasono¬graphy
Organized several scientific congresses and seminars, e.g. "Endoskopie des Internisten" (annual), Munich Postgraduate Course on Gastroenterology and Endoscopy (annual), Endoscopic Ultrasound Courses, 8th International Symposium on Endoscopic Ultrasonography and Computers in Endoscopy (1991) and others. Chairman 2002 and General Secretary 2002-2006 of the Endoscopic Section of the DGVS. Organisation of the annual meeting of the German Society in Bonn under the direction of the President Prof. T. Sauerbruch. Since 2008 member of the organisation board of Endoclub Nord (president 2009, 2012, 2015), the worldwide largest endoscopic live demonstration meeting. 2013-2014 president of the DGEBV and the national meeting in April 2014.
Assistant Editor of the journal Endoscopy 1991-2003 (Editor-in-Chief: Professor Classen), 2004-2013 Editor-in-Chief, during these periods rise of impact factor from 1.4 to 5.7. From 2013 onwards Deputy Editor Endoscopy for the journal Gut. Editor of the Teaching Platform Endoscopy Campus of the German Societies DGEBV and DGVS
Member of the Boards of the Germans Society of Gastroenterology (DGVS) and of its Endoscopic Section.